Which change to an object would reduce its potential energy by half? A. Increasing its height to twice its original value
OB. Reducing its mass to one-quarter of its original value
O C. Increasing its mass to twice its original value
O D. Reducing its height to one-half of its original value

Tafari worked one summer on a ship that set weather buoys in the ocean. he watched how one of the buoys moved in the water. describe which parts of the wave would cause the buoy to bob up and down. which wave property determined how fast the buoys bobbed in the water? he observed that when the wind blew harder, the ocean waves were larger, and the buoys moved away from the ship. what effect, if any, did the waves have on how far the buoys moved? explain your answer.

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?